Automatic variable-riffle belt concentrator.



APPLICATION FILED JAN.18, 1913.

3 SHEETS-SHEET 1- Patented Aug. 17, 1915.

Q 0 Q O O O D Q O O Q O O A A a 1 o a a a o a o n e a e n a cog u o u o o u o o a o u a a w on, u a o o a a o n u- :L o a u o a nnwucnn N ITX NWANM NW E m AMM YA Ne YMR H. EGGERS.

AUTOMATIC VARIABLE RIFFLE BELT CONCENTRATOR.

' APPLICATION FILED JAN-3,1983.

1,150,257. Patented Aug. 17, 1915.

3 SHEETS-SHEET 2.

H, EGGERS.

AUTOMATIC VARIABLE RIFFLE' BELT CONCENTRATOR.

APPLICATION FILED JAN-18,1913.

. Patented Aug. 17, 1915.

3 SHEETSSHEET 3.

QM ww w To all whom it may concern:

particles of ore pulp.

V the same, looking HENRY EGGEBS, OF DENVER, COLORADO.

AUTOMATIC VARIABLE-EIFFLE BELT CONCENTRATOR.

ma am.

Be it known that I, HENRY Eeonns, a citizen of the United States of America, residing in the city and county of Denver and State of Colorado, have invented anew and useful Automatic VariableRiiile Belt Cons centrator, of which the following is a specification.

My invention relates to a new automatic variable-rifle belt concentrator, and the objects of my invention are: 'First, to provide an endless belt concentrator, that is provided with a variable ritlled concentrating surface, that acts to automatically separate the gangue matter from. the mineral particles of ore pulp and concentrates, and saves a very high percentage of the mineral Second, to provide an endless belt concentrator that is provided with sunken or recessed rilfles, which areal-ranged and adapted to automatically,

successively, and gradually decreasein their cross sectional area as the belt travels from its ore pulp receiving end to its mineral discharging end. And third, to provide an ore pulp endless belt concentrator that is provided with a flexible belt that can be folded into sunken riffled traveling concentrating surfaces, the riifles of which are arranged to decrease 111 cross sectional area from its ore pulp receiving end to its mineral discharging end. I attain these objects by the mechanism illustrated in the accompanying drawings, in which:

Figure 1, is a plan view ,of the improved belt'concentrator. Fig. 2, is a side view of from the discharge side of the machine. Fig. 3, is an end View of the discharge end of the machine. Fig. 4, is a plan view on an enlarged scale of the rollers which support the belt and form the riftles therein, the belt and strips attached thereto being shown in section. Fig. 5, is a sectional view on an enlarged scale of a portion of the belt, showing the rubber strips attached thereto. Fig. 6, is a similar view showing the strips turned at right angles, and the belt folded into riflies between the strips. cation in the means for forming the rifiies in the belt. Fig. 8, is an end View looking from the feed end of the device shown in Fig. 7 Fig. 9, is a view of the opposite end to that shown in Fig. 8. Fig. 10, is a perspective view of one ofthe knife edge bear- Fig. 7, is a plan view of a modifi- V I Specification of Letters Patent. Patented Aug. 17, 1915. Application filed January 18, 1513. SerialrNo. 742,917.

ing plates. And Fig. 11, is a detailed perspective view illustrating a portion of the belt frame, showing one of the suspension rods in engagement therewith.

Similar letters ofreference refer to similar parts throughout the several views.

Referring to the drawings, the numeral 1 designates the supporting structure of my improved concentrator, which is constructed of structural iron, and comprises a rectangular frame 2, parallel U-shaped portions 3 and 4, at opposite ends thereof, which are spaced from the under side of the frame 2, and form therewith supports for the journal boxes 5 and 6, the boxes 5 being adjustable, while. the boxes 6 are stationary, and side bars 7 below and parallel with the side bars of the frame 2, the former bars having upturned ends which are secured to the U- shaped members 3 and 4. The U-shaped members are secured to the frame 2, in any suitable manner, such as by plates 8, and the frame 2, and bars 7, are connected by opposite pairs of vertical angle bars 9. The bars 7 are further connected to the side bars of the frame 2, by brace bars 10. At the opposite end portions of this frame, I mount in the journal boxes 5 and 6, shafts 11 and 12, upon which I mount rollers 13 and 14. The roller 14, which is at the feed end of the machine, is provided with a plurality of projecting collar portions 15, and a plu- .sixteenths of an inch in width. Both the collar portions and the grooves'may be made wider or smaller, as desired.

The roller 13, which is positioned at the concentrates discharge end of the concentrator, is provided with alternating collars and grooves 17 and 18 respectively. The collars, however, of the roller 13, are each provided with a hub portion or step 19, which portions constitute the bottom bearing seats for the automatically progressively closing riflles, which will be described more fully hereinafter.

Beneath the roller 13 is mounted a roller 20, of the same diameter as the rollers 13 and 14, but grooved to correspond to the roller 14. The shaft of this roller is journaled in bearings 21, on the adjacent upturned ends of the bars 7. 1

On the bars 7 adjacent to the rollers 20 and 14, are mounted rollers 22 and 25 re- 7 spectively, and on the brace bars 10 are mounted rollers 23 and 24.

Around the rollers 13, 14c and 20, and over' cloth fabrics or pliable rubber. This belt is considerably wider than the length of the rollers, and is folded into a number of successive small folds to form a series of riflles that automatically decrease in'width from the ore pulp feeding end of the belt to its concentrates discharging end," as will be fully described hereinafter. This flexible belt is provided on its inner face with a plurality of strips 27 of rubber or other suitable material, which fit into the grooves of the rollers 13 and 14. These strips are secured to the belt at exactly the center of their widths, and only at their centers, by being sewed thereto by threads or by wire, or by being tacked thereto or by any other suitable means. Consequently each of these strips extends throughout the entire circumference of the belt. These rubber strips are thus free to be turned up edgewise to fit into the grooves of the rollers 13 and 14, and when they are so turned they fold a portion of the width of the belt between them, which folded portions rest upon the peripheries of the collar portions of the said rollers, and as these strips are secured along their centers to the belt, the belt is carried down the side of one strip to the adjacent collar of the roller, then across the top of the collar and up the opposite side of the adjacent strip, and over its top edge,- and down its side and across the next collar and again up the side of the next strip, and so on across the rollers, the folded portion between the strips forming riil'les 28, that receive and hold the Y ore pulp, which is fed onto it from the feed hopper 29 through suitable discharging apertures 30 formedalong its lower edge. These riflles fill up with ore pulp, which is finely crushed ore mixed with sufficient water to make a flowing stream, the ore flowing onto the flat top portions of the belt that rest on top of the edges of the strips, and flowing into the riflles adjacent to the feed hopper, and then overflowing from them across the surface of the belt. The belt is given a variable speed traveling movement, as well as a variable stroke reciprocal movement, which moves the ore along-in the riffles and across the table, as will be fully described hereinafter.

As the belt travels with a reciprocal traveling movement from its feed end to its discharge end, the riffles formed between the strips of the belt at the feed end and the strips and collars of the roller at the dis charge end gradually and automatically grow narrower in width,-wl1ich causes the ore pulp in them to be moved and its lighter gangue and mineral particles to be forced up from among the heavier particles of ore pulp within them, and discharged from them under the natural force of gravitation,

and the reciprocal and traveling movement of the belt, WlllCllllC-Bl'lClS to cause the heavier particles of the mineral to settle in the bot- 7 tom of these riflles, and tlieynatui'ally force the light gangue matter and the lighter mineral particles up out of thesaidrifies, and these'are washed across the belt by wash water, which is distributed onto the belt the belt frame, as will be hereinafter set forth. The ore pulp feedhopper is suitably secured to the adjacent side of the belt frame. The grooves 18 of the roller 13 are twice the depth of those in the roller 14:, or i the same depth as the thickness of the strips 27 on the belt, and the annular hubs or shoulders 19, on this roller, upon which rest the portions of the beltforming the bottoms of the rii'iles, are of such diameter as will give the same depth to the riflie at this end of the machine as at the feed end tliereof', as will be understood by referenceto Fig. 4.

The rifile forming portions of the belt that lie between the strips 27 and the collars of the roller 13, and'onthe tops of the hubs '19 of said roller, are of much less width at the mineral discharging end of the belt than at its feed end. 7 This reduction in the width of the riflle is caused by a series or plurality of rollers 34-, posi tioned intermediate of the rollers '13 and 14, and spaced at, a short distance apart along the length ofthe belt. These rollers 34* are provided with shafts and are journaled in suitable boxes 35, that are secured to the sides of the belt supporting frame 2 of the concentrator. 7 provided with annular shoulders or hubs 36, which are arranged in alinement with the hubs and collars respectively of the rollers '13 and 14, and they are also each provided with grooves 37, in line with the grooves in the rollers 13 and14. All ofthese rollers with the'exception of the first two rollers 38 from the roller 1e, are provided with flanges 39, which increase progressively in thickness from thefeed end of the machine to its discharge end, which are in line with the collars or flanges 17 of the roller 13, and

they make continuous straight line or row of grooves and collar flange portions These rollers 34 are each fromthe roller 13 to the roller lh and the rifl'le making strips of the belt travel in the grooves of all of these rollers, and the belt travels on top of the collar'portions.

7 and are pushed in, and the said riffles are CIK narrowed in cross section. The loose portion of the belt that folds down and forms one side of a riflie, is crowded over toward its opposite side, .which is sewed or other- 'wise secured to one of the rubber strips, and

the flange on the next roller isa little thicker and crowds the loose fold of the belt a little farther over toward the secured side of the riflle, and the flanges of the next roller are a little thicker than those of the second flanged roller and consequently move the loose sides of the rifilesof the belt a little closer to their opposite sides that are secured to the rubber strips of the belt, and consequently decrease the cross sectional areas of the riflies. Thus the flanges of each succeeding roller toward the roller 13, are a trifle thicker and reduce or decrease the I cross section areas of the riffles, as the belt travels from the'roller 14 to the roller 13, which is the mineral'discharge end of the belt, where each riflle is reduced to about onefourth of the cross sectional area of the riflle at its feed end, which is preferably about one-half of an inch wide and about a quarter of'an inch deep. At the mineral discharge end, the riiiles are of the same depth, but are narrowed by the flanges to a width of about one-eighth of an inch. It will thus be seen that the belt riflles are of the same depth through the length of the belt, but are decreased in width automatically by the successively and progressively increasing thickness of the flanges of the rollers between the rollers 13 and 14'. After the belt leaves the mineral dischargingroller 13, it passes down and around the roller 20, which is provided with collars and grooves of the same size and arrangement as those on the roller 14, and the belt riflies open out to the same width they have on the roller 14-, and the belt in passing around the roller 20 dips into a tank 40, containing water, and the mineral concentrates are washed from it and from its riflles. Or if desired a spray of water may be used to wash these concentrates from the belt into the tank. I do not illustrate this spray, as it does not form any part of my present invention. From the roller 20,'the belt travels over the supporting rollers 22, 23, 24, and 25, which are supported in the mannerabove described, upon the frame of the concentrator. At the feed side of the belt, the ends of the rollers 13 and 14 are provided with enlarged outwardly extending flanges 4+1, which are adapted to turn the feed side edge of the belt slightly upward to prevent ore pulp or mineral from working over that side edge of the belt.

The belt frame is providedwith a suppor ing and tilt-mg mechanism which comprises standards 34, having right angled upper ends, provided with holes 42, through which rodsd3 extend loosely. Nuts 4% are threaded to the upper ends of the rods, and knife edge washers 45 are placed on the bolts between the nuts and the top of the standard. upon which they rest.

The lower ends of the rods .t3,arebifurcated, and the bifurcated wardly bent to form hooks the heads 47 of T-shaped arms or projections -18, which extend from plates 49, which are bolted or otherwise secured to the pairs of vertical angle bars 9, adjoining the side bars 7, as fully shown by Fig. 11. The belt frame is thus suspended from the upper ends of the standards 3%, by the said rods 43, carrying the knife edge plates or washers, shown in Fig. 10, and whichbear upon the said upper ends of the standards, whereby a reciprocating movement may be imparted to the table, in a manner to be presently set forth. The belt frame may also be tilted to slant downward from. its feed side, by screwing down the nuts upon the end of the rods 43, on the said feed side of the frame, by which the frame is lifted on that side, as will be understood.

As previously stated, the bearing boxes 5 for the shaft of the roller 13, are adjustable, and to these boxes are connected the inner ends of threaded rods 50, in such manner that the rods may be turned. The outer portions of these rods extend through threaded blocks 51, which are secured between the U- shaped frame member 3, and the rectangular frame 2, and their outer ends are provided with hand wheels 52. wheels 52, the boxes 5 are moved in or out, as the case may be, carrying with them the portions are up- -il-6, which engage roller 13. In this manner, the tension on the belt may be regulated, as

will be fully understood by reference to Figs. 1 and 2. The belt frame may be reciprocated in any suitable way. I have, however, illustrated a driving mechanism, which consists of a driven shaft 53, mounted in suitable bearings 5a, which are bolted to a frame 55. adjacent the feed end of the belt frame. This frame is preferably supported upon foundation beams 56, which also support the standards 34, from which the belt frame is suspended. The shaft 53 carries tight and loose pulleys 57 and 58, respectively, which are adapted to be connected by a belt-not shownwith the pulley of a drive shaft.

A common form of eccentric 59 is also mounted on this'shaft, having a rod 60, which is pivotally connected at its opposite end to a bracket arm 61, secured to the adjacent end of the belt frame. The eccentric is designed to impart short, quick reciprocationsto the belt frame, as will be understood.

A friction pinion or disk 62, is slidably By turning the hand 64, having an annular groove, into which extends one end of a follower 65, which is mounted on a threaded rod 66, which is 1'0- tatably mounted in bearings 67', to lie parallel with the shaft 53. The outer end of the rod 66, is provided with an operating hand wheel 68, and when the rod is turned, the

follower 65 is moved backward or forward, as the case may be, carrying with it the friction disk 62. V

The periphery of the disk 62, is in frictional contact with the face of a friction wheel 69, which is rigidly mounted on one end of a shaft 70, which is supported in bearings 71 and 72, on the frame 55, and adjacent standard 34:, respectively. The opposite end of the shaft 7 O is connected by a universal joint 73, with one end of one section 7 3 of a divided shaft. Upon the opposite end of this section is rigidly secured a sleeve 74, which projects a considerable distance beyond the said end. One end of the other section 75, of this divided shaft, its slidably in the said sleeve, but so as to be turned by the sleeve, any suitable means for effecting this operation being employed, such as a feather key 76, as shown in Figs. 1 and 2.

The opposite end of the shaft section 75, is connected by a universal joint 77, with a short shaft 7 8, which is mounted in bearings 79, secured to the U-shaped frame member 3. The opposite end of the shaft 78, is provided with .a worm pinion 80, which meshes with a worin wheel 81, on the adjacent end of the shaft carrying the roller 13. Rotary motion is thus transmitted from the shaft 53 to the roller 13, by engagement of the friction pinion 62, with the friction wheel 69, by which the shaft sections 70, 73 75,

and 7 8 are rotated, the latter shaft carrying the, worm pinion 80, which turns the worm wheel 81, on the shaft of the roller 13. Thus the belt 26 is moved in the direction of the arrow, and the speed at which it travels is determined by the position of the friction pinion 62, relatively to the axis of the friction wheel 69, as will be understood.

In Figs. 7, 8 and 9, I have shown a modi- 'fication in the means for forming the rifiles in the'belt. In this modification, I employ' a platform 82, which is rigidly secured to the rectangular frame 2,'immediately beneath V the belt 26. This'platform isadapted to take'the nlaceof the rollers 341 and to this end is provided with a plurality of parallel grooves 83, which receive the rubber strips 27, on the belt 26. These grooves are formed by spaced strips 84 of wood, which are secured to the platform.

Upon the strips 84, are secured other strips 85, having front edges parallel'with V and flush with the sides of the grooves 83, next the feed side of the belt, while their opposite edges are divergent from their front edges, the said strips being narrowest at the feed end of the belt, and widest at the discharge end thereof, the walls formed by these divergent or slanting edges and the sides of the strips 27 in the adjacent grooves 83, constituting rilile-forming guides, by which the portions of the belt between the strips 27 are automatically folded into riffies, which decrease in width from'the feed end of thebelt, to the discharge end thereof.

The operation of my improved variable rifile belt concentrator, is as follows: The ore pulp flows into the feed hopper through a laundernot shownfrom a source of supply, and distributes itself upon the belt through the apertures. along the lower side of the feed hopper. This ore pulp flows naturally across the belt, which is adjusted to an inclination to suit the character of the ore being treated, and this ore pulp as it flows across the belt, enters and fills the variable rifiles that are formed in the belt by the end roller let to the mineral dischargeroller I as automatic folding actionof the rollers, as the belt passes over them' from the feed- 13, and the belt is .also given through its driving mechanism a reciprocating movement,

which can be regulated for more or less throw as ,desn'ed. Consequentlythe comb1- nation of the transverse flowing movement of the ore pulp down the inclmed belt, and the reciprocal movement of the belt, causes the ore pulp to feed along the belt in the riflles', at

the same time that aportion of it is feeding across the belt, and as the result of these two movements of the ore pulp, it flows -in a diagonal line from the feed hopper of the machine to the diagonally opposite lower corner of the belt, while the mineral particles settle in the riiiles and are caught by l them, and under the reciprocating-action of the belt the heavier particles sift down to the bottom of the ,riffle's, and the. lighter gangue matter and the lighter particles of mineral work up in these riftles to the top,

and arecarried across the belt and continumineral particles. The. rifties themselves de-- 1 crease continuously and gradually, from the feed end of the table to the concentrated mineral discharging end of the belt, and this gradual and continuous narrowing and decrease in the; cross section area of these rilfles, also tends to cause the mineral paralong the upper edge of the belt-adjacent to the feed hopper, and the quantity of water admitted to the table can be regulated by any suitable means. As the mineral particles work along toward and to the dis- ,charge end of the belt, the heavier particles at all times work, under the action of the belt and the wash water, to eject from among themand from these rifiles, the gangue matter and the lighter mineral particles, which become middlings and are known as the middlings product. This product passes off the lower sideof the table, near or adjacent to its lower corner 86, the table being tilted to any desiredangleto discharge this middling products-off at or adjacent to this corner. The mineral in the riffles after it passes over the discharge roller 13, passes down and over the roller 20, and as this 7 roller is arranged to spread and open out these automatically folding and variable size :riffles, when they reach the lower roller 20,

theyare open to their full width, and the mineral falls by gravity into the tanker is washed off by a spray of water or can be naturally washed ofi by filling this tank with enough water to submerge the belt as it passes around the lower edge of theroller 20. The belt then travels under themachine over the idler rollers, to the end roller 14,

V the riflies all the time remaining to their full 40 size, and remain this way afterthey pass over the roller H until they strike the flanged rollers that lie along the whole length of the frame of the machine underneath the belt, and these flanges successively and continuously and gradually close and narrow and decrease, the width of these rifiies automatically, as the belt moves to and passes over the end roller 13.

My inventionprovides a concentrator that contains within itself the means of providing automatically a variablesized sunken or recessed riflies; that are capable of acting upon the mineral particles that. flow into them to aid and assist to separate the gangue matter and lighter mineral particles of an ore pulp from its heavier particles, and thus enable my concentrator to effect a much larger percentage of saving in concentrating ores than has hitherto been attained; and while I have illustrated and described the .preferred arrangement and constructionof my lmproved automatic varlable riflied belt concentrator, I do not wish to be limited to the construction and arrangement shown, as ,many changes might be made therein with out departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In combination, an endless concen trating belt of flexible material, means for folding said belt to form one or more channels, extending longitudinally of the belt, and means for gradually "narrowing said channels along the concentrating zone.

2. In combination, an endless concentrating belt of flexible material, means for folding said belt to form one or more channels extending longitudinally of the belt, means for graduallynarrowing said chantnels along the concentrating zone, and means for expanding said channels after passing the concentrating zone. r

3. In an automatically variable riffled endless belt concentrator, the combination of an endless belt, a supporting frame arranged to be adjustably tilted, means for imparting a reciprocative movement to said frame, of a plurality of rollers arranged on the frame of said machine adapted to support the concentrating surface of said belt, and means connected with said rollers and including a series of collarsand recessed portions and of flanges arranged and adapted to form sunken rillles on said belts, and to automatically decrease the cross sectional area of surface of said belt from its ore pulp feeding and receiving end to mineral discharging end.

4. A, concentrator comprising an endless belt, means for folding the belt into rifiles across its concentrating surface, and means for gradually decreasing the width of the riifles from the feed end of said belt to its concentrates discharging end. 7

5. In a belt concentrator, the combination with a supporting frame, of an endless belt mounted thereon, means for automatically folding said belt into a series of recess riffles, and means for gradually and progressively decreasing the cross sectional area of said recess riflles from the feed end of said belt to its mineral discharging end.

6. Abelt concentrator provided with operatively arranged tilting and reciprocating mechanisms, means for automatically folding said belt into recessed or sunken riffles extending entirely across the mineral concentrating zone of said belt, and means for decreasing the cross section area of said recessed or sunken rifiles continuously, and gradually along the concentrating surface of said belt from its ore pulp receiving end its concentrated to its concentrated mineral discharging end.

charge end of the belt.

" being provided with stepped annular grooves whereby the belt is folded to form a series of sunken riflles which decrease in cross sectional area from the feed end to the dis- 8. In a concentrator as specified, the combination with a suspended, reciprocable frame, of rollers mounted therein, an endless belt upon said rollers, the rollers being adapted to fold the belt into aseries of sunken riflles, which decrease in width from the feed endof the machine, and means for -widening the rifiles on the return lap of the belt.

9. In a concentrator as specified, the combination with a. suspended, reciprocable frame, of annularlyrgrooved rollers at op- .posite ends of the frame, an endless belt on said rollers, endless flexible strips on said beltwhich enter the grooves of said rollers, and a plurality of annularly grooved rollers disposed. between said end rollers, said latter rollers and one of said end rollers having flanges between which and the strips the belt is automatically folded into vsim-kenrillles, whichdecrease in width in the direction of the travel of the belt, and means for widening the riilies on the return lap of the belt.

10. Ina concentrator as specified, the com-,

bination with a suspended, reciprocable frame, of an annularly grooved roller at the feed end thereof, an annularly grooved rollerat the discharge end thereof, and annularly-grooved rollers of smaller diameter,

' disposed between said end rollers, the latter rollers andthe discharge-end rollerhaving V flanges which increase successively in thickness from the feed end of the frame, an endless belt on saidrollers, endless flexible strips 40 on said belt which enter the grooves of said rollers, said flanges being adapted to' auto matically fold the belt between them and the strips to form sunken rifiies which de- "crease in width from the feed end of the frame, and an annularly grooved roller beneath the discharge end roller, which is adapted to widen the riflles, on the return lap of the belt. 7

11'. In a concentrator as specified, the

combination with a suspended, reciprocable frame, rollers mounted therein, an endless belt on said rollers, means for automatically folding the belt to form sunken rifi'les which a decrease in width from thefeed end of the frame, and means for widening the riflles onthereturn lap of the belt. j 12. In a concentrator asspeci'fied, a suspended reciprocable frame, an annularly grooved roller at the feed emi of-said' frame,

a 'ing alternating annular grooves and stepped? '1 flanges, an endless belt on' saidrollers, flexible endless strips secured midway of their widths, to said belt, and adapted .toen'ter. the grooves of said rollers, said strips being 1 given aquarter turn to fold the 'belt between i them, before they are placed in the grooves of the rollers, theffianges of saidrollers and said strips being adapted to form the said folded portions mto' riffles which decrease in width from the feed end of the frame, the

bottoms of said riflles resting upon the step portions of the'flanges, and a roller beneath V the dischargeend roller adapted to widen outthe rillles on the returnlap of the belt.

13. In 'an endless belt concentrator, means for forming sunken riflles in the upper lap of the belt, whichdecrease in width toward the discharge end of the belt, comprising an nularly groovedsupporting rollers, and endless resilient spaced strips on said belt, which enter said grooves, said belt being folded between said strips. 9

14. In an endless belt concentrator, means for automaticallyforming sunken riflle in .7 the upper lap of the belt, which decrease in width toward its discharge end, and means for widening out the rifiies on the return'or under lap of the belt 15'. In a belt concentrator as specified, the combination with asuspended reciprocable frame, of rollers mounted on saidframe 1 7 having alternating grooves" and flanges, an endless belt on saidi'rollers, endles flexible strips on said belt whichlie in the grooves of said rollers, portions of. said belt being folded between said strips and the flanges of said rollers as the belt travels forward, 10 thereby forming riffies which decrease in width from the feed end of the belt, and beveled flanges on the feed side ends of said rollers for forming an upturned lip on the upper lap of said belt.' t

In testimony whereofIaffix my signature in presence of two witnesses. a

' HENRY EGGERS.

Witnesses:

I G. SARGENT ELLIOTT,

ADELLA M. FowLia.

Copies pt this patent may be obtained for five cents each, by addressing the Commissioner of Patents, i r Washington, D, G. i 

